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World Reference Base for Soil Resources (WRB) is an international soil classification system for naming soils and creating legends for soil maps. It is edited by a Working Group of the International Union of Soil Sciences (IUSS). The currently valid edition is the update 2015 of the third edition 2014. WRB has two hierarchical levels: The first level presents 32 Reference Soil Groups (RSGs), which are identified using a key. RSGs are groups of soils that have undergone similar pedogenesis or have been formed from similar parent material or represent major ecological regions. In the second level, the soil names are constructed by adding a set of qualifiers to the name of the RSG. For the second level, 185 qualifiers are defined. Some can be combined with many RSGs, others with only a few or even with just one. The qualifiers available for use with a particular RSG are listed in the key, along with the RSG. They are …